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  • How to parse mathematical expressions involving parentheses

    - by Rob P.
    Please forgive my title, I really don't know how to phrase it better. This isn't a school assignment or anything, but I realize it's a mostly academic question. But, what I've been struggling to do is parse 'math' text and come up with an answer. For Example - I can figure out how to parse '5 + 5' or '3 * 5' - but I fail when I try to correctly chain operations together. (5 + 5) * 3 It's mostly just bugging me that I can't figure it out. If anyone can point me in a direction, I'd really appreciate it. EDIT Thanks for all of the quick responses. I'm sorry I didn't do a better job of explaining. First - I'm not using regular expressions. I also know there are already libraries available that will take, as a string, a mathematical expression and return the correct value. So, I'm mostly looking at this because, sadly, I don't "get it". Second - What I've tried doing (is probably misguided) but I was counting '(' and ')' and evaluating the deepest items first. In simple examples, this worked; but my code is not pretty and more complicated stuff crashes. When I 'calculated' the lowest level, I was modifying the string. So... (5 + 5) * 3 Would turn into 10 * 3 Which would then evaluate to 30 But it just felt 'wrong'. I hope that helps clarify things. I'll certainly check out the links provided.

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  • is there a GetElementByTagName that handles if the tag isn't there

    - by oo
    i have the following code below but sometime the "serving_description" tag isn't there. Right now i just put a try catch around it but i wanted to find out if there was a cleaner way to handle this scenario. XmlElement servingElement = (XmlElement)servingNode; serving.Id = Convert.ToInt32(servingElement.GetElementsByTagName("serving_id")[0].InnerText); serving.Name = servingElement.GetElementsByTagName("serving_description")[0].InnerText;

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  • Regex to match a Java method signature

    - by nitesh
    I am having this particular requirement where a method has to be identified by different regular expressions for different components. For example, there need to be a regex for return parameter, one for method name, one for argument type and one for argument name. I was able to come up with an expression till this step as follows - ([^,]+) ([^,]+)\((([^,]+) ([^,]+))\) It works well for a method signature like - ReturnType foo(Arg parameter) The regular expression identifies ReturnType, foo, Arg and parameter separately. Now the problem is that a method can have no/one/multiple arguments separated by commas. I am not able to get a repeating expression for this. Help will be appreciated.

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  • Retrieving Date in ASP

    - by user294510
    I want to retrieve the moth from a date(in textbox),then If that retrieved month is January ,some functions have to be added. CurrDate =session("txtdateFrom") CurrMonthID=session("txtdateTo") CurrMonthName=MonthName("CurrMonthID") iF CurrMonthName=January /* This portion have error */ /* some functions */ else if CurrMonthName= February /* some functions */

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  • Partially parse C++ for a domain-specific language

    - by PierreBdR
    I would like to create a domain specific language as an augmented-C++ language. I will need mostly two types of contructs: Top-level constructs for specialized types or declarations In-code constructs, i.e. to add primitives to make functions calls or idiom easier The language will be used for scientific computing purposes, and will ultimately be translated into plain C++. C++ has been chosen as it seems to offer a good compromise between: ease of use, efficiency and availability of a wide range of libraries. A previous attempt using flex and bison failed due to the complexity of the C++ syntax. The existing parser can still fail on some constructs. So we want to start over, but on better bases. Do you know about similar projects? And if you attempted to do so, what tools would you use? What would be the main pitfalls? Would you have recommendations in term of syntax?

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  • How can I use "PHP Simple HTML DOM Parser" to get the contents of an <h1></h1> tag?

    - by KeriLynn
    I'm new to PHP =) Right now I am using PHP includes for my site template. I have my header, containing all my <head></head> info. What I want to do is write a code that will take the contents of the <h1></h1> tag from the page, and echo it into the <title></title> tag in my header.php include. I got the PHP Simple HTML DOM Parser from here: http://simplehtmldom.sourceforge.net/, and I found a code (I forget where in all my googling) that goes like this: <?php $url = (!empty($_SERVER['HTTPS'])) ? "https://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'] : "http://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI']; $html = file_get_html('http://www.google.com/'); foreach($html->find('#content h1') as $element){ echo $element->plaintext;} ?> That I think is supposed to echo the h1 tag contents? Like I said, I'm new to PHP and I only know the basics, and I don't know really know any OOP (yet), so I'm sorry if I'm asking a dumb question. It looks like it's getting the current page, then putting the contents of the h1 tag into the variable $element, and then echoing it. But nothing happens when I put it into my page. Can anyone help me with what I'm doing wrong? Thank you for reading!! =)

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  • Find XmlNode where attribute value is contained in string

    - by bflemi3
    I have an xml file... <?xml version="1.0" encoding="UTF-8"?> <items defaultNode="1"> <default contentPlaceholderName="pageContent" template="" genericContentItemName="" /> <item urlSearchPattern="connections-learning" contentPlaceholderName="pageContent" template="Connections Learning Content Page" genericContentItemName="" /> <item urlSearchPattern="online-high-school" contentPlaceholderName="pageContent" template="" genericContentItemName="" /> </items> I am trying to find the first node where the urlSearchPattern attribute is contained in the string urlSearchPattern. Where I'm having trouble is finding the nodes where the attribute is contained in the string value instead of the string value be contained in the attribute. Here's my attempt so far. This will find the firstOrDefault node where the string value is contained in the attribute (I need the opposite)... string urlSearchPattern = Request.QueryString["aspxerrorpath"]; MissingPageSettingsXmlDocument missingPageSettingsXmlDocument = new MissingPageSettingsXmlDocument(); XmlNode missingPageItem = missingPageSettingsXmlDocument.SelectNodes(ITEM_XML_PATH).Cast<XmlNode>().Where(item => item.Attributes["urlSearchPattern"].ToString().ToLower().Contains(urlSearchPattern)).FirstOrDefault();

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  • PHP Regular Expression to quotations to attributes

    - by atwellpub
    hey Guys, I need to run a string of html through a regex function that checks to see if the attributes are closed in quotes, and if they aren't then close them. for example i want <img src=http://www.domain.com/image.gif border=0> to turn into <img src='http://www.domain.com/image.gif' border='0'> Can anyone help me?

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  • Why is this not a valid XML DTD? (Parameter entity and #PCDATA)

    - by user68759
    Hi, Using the DTD validator here, I am informed that the following DTD is invalid. <!ENTITY % text "(#PCDATA|L)*"> <!ELEMENT H (%text;)+> <!ELEMENT L (#PCDATA)> The error message is: "A '(' character or an element type is required within declaration of element type "H"." at line 2, column 22. Can anyone please point out why it is invalid? The error message is not exactly very friendly to me. Thanks.

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  • Regex: Match any character (including whitespace) except a comma

    - by selecsosi
    I would like to match any character and any whitespace except comma with regex. Only matching any character except comma gives me: [^,]* but I also want to match any whitespace characters, tabs, space, newline, etc. anywhere in the string. For example, I would like to be able to match all of this up until the comma: "bla bla bla" "asdfasdfasdfasdfasdfasdf" "asdfasdfasdf", Is there a simple way to do this without knowing where the whitespace may be?

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  • Getting started with parser in java code

    - by giri
    Hi I am noob to parsers.I like to fetch specific data from a website I need to use parsers for that. Can anybody please tel me how to get started with parsers.What do I need to download? Can anybody the code to fetch the data from a website using parsers in java. Thanks in advance.

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  • How to Parse 'Mathy' Stuff...

    - by Rob P.
    Please forgive my title, I really don't know how to phrase it better. This isn't a school assignment or anything, but I realize it's a mostly academic question. But, what I've been struggling to do is parse 'math' text and come up with an answer. For Example - I can figure out how to parse '5 + 5' or '3 * 5' - but I fail when I try to correctly chain operations together. (5 + 5) * 3 It's mostly just bugging me that I can't figure it out. If anyone can point me in a direction, I'd really appreciate it.

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  • how to find specific XML data by attribute name/value in flash AS2?

    - by CCrawler
    Given the following XML code: <set name="thumbsBooks"> <set name="pdf"> <thumb>Data I want to access</thumb> <thumb>Data I want to access</thumb> </set> <set name="printed"> <thumb>Data I don't want to access</thumb> <thumb>Data I don't want to access</thumb> </set> <set> I want to be able to get the data contained in the "thumb" tags using the "name" attribute value of the parent tag as a selector, something like you would do in jQuery: $('set[name="pdf"]').find('thumb'); Is there a method like this in Action Script 2 (can't use AS3)?

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  • Date based publishing ASP.NET MVC

    - by kayluhb
    I am building a custom CMS in ASP.NET MVC and one of the requirements is that the content has a start and end date that dictates whether or not the page appears on the site. What is the best approach to this? Should I run some sort of chron job to mark the status of the page according to its publish dates? Does anyone have any resources or advice on the matter?

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  • Pagination of Date-Based Generic Views in Django

    - by Apreche
    I have a pretty simple question. I want to make some date-based generic views on a Django site, but I also want to paginate them. According to the documentation the object_list view has page and paginate_by arguments, but the archive_month view does not. What's the "right" way to do it?

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  • strip version from package name using Bash

    - by cd1
    hi, I'm trying to strip the version out of a package name using only Bash. I have one solution but I don't think that's the best one available, so I'd like to know if there's a better way to do it. by better I mean cleaner, easier to understand. suppose I have the string "my-program-1.0" and I want only "my-program". my current solution is: #!/bin/bash PROGRAM_FULL="my-program-1.0" INDEX_OF_LAST_CHARACTER=`awk '{print match($0, "[A-Za-z0-9]-[0-9]")} <<< $PROGRAM_FULL` PROGRAM_NAME=`cut -c -$INDEX_OF_LAST_CHARACTER <<< $PROGRAM_FULL` actually, the "package name" syntax is an RPM file name, if it matters. thanks!

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